What This Visualizer Shows
The interactive panel above uses a simulated signal, not an uploaded file. The signal includes quiet speech-like sections, a louder sustained passage, a gradual build, and short transient peaks so you can see how a compressor reacts to different kinds of level changes.
The gray line is the original waveform. The green line is the compressed waveform after threshold, ratio, attack, release, and makeup gain are applied. The warm area below the waveform shows gain reduction, which is how much level the compressor is taking away over time. The dashed threshold line marks the level where compression starts to react.
- Original waveform shows the unprocessed simulated signal.
- Compressed waveform shows the result after dynamic compression.
- Gain reduction shows when and how strongly the compressor turns the signal down.
- Threshold line helps you see which peaks are high enough to trigger compression.
Threshold Explained
Threshold decides where compression begins. When the signal stays below the threshold, the compressor mostly leaves it alone. When the signal rises above the threshold, the compressor starts reducing the excess level according to the ratio and timing settings.
Lowering the threshold means more of the signal crosses the line, so gain reduction happens more often. That can help uneven speech, but a threshold that is too low can make the whole sound feel flattened. Raising the threshold limits compression to only the loudest peaks.
If you lower threshold and the gain reduction area stays active almost all the time, the setting is probably heavy for natural speech.
Ratio Explained
Ratio controls how strongly the compressor reduces the part of the signal above the threshold. A 2:1 ratio is gentle: level above the threshold is reduced by about half. A 4:1 ratio is common for voice because it gives firmer control without immediately sounding like an effect.
At 10:1 or higher, the behavior starts to feel limiter-like. That does not make it a true limiter, but loud peaks are held back much more aggressively. Use the ratio slider with the same threshold setting and watch how the compressed waveform stops rising as freely.
| Ratio range | Compression character | Good learning cue |
|---|
| 1:1 to 2:1 | Very gentle or nearly no compression | Waveform stays close to the original |
| 3:1 to 4:1 | Moderate control for speech and podcast voice | Peaks shrink while the shape remains recognizable |
| 6:1 to 10:1 | Strong peak control | Compressed peaks become visibly flatter |
| Above 10:1 | Limiter-like response | Gain reduction jumps quickly on loud sections |
Attack and Release Explained
Attack controls how fast the compressor reacts after the signal crosses the threshold. Fast attack catches peaks quickly, which is useful for sharp bursts, but it can also dull transients and make speech or instruments feel less lively. Slow attack lets more of the initial hit pass through before the compressor clamps down.
Release controls how fast the compressor recovers after the signal drops back down. A release that is too short can cause pumping because the level rises and falls too obviously. A release that is too long can keep the signal reduced after the loud part is gone, making the next section feel pushed down.
- Use fast attack when sudden peaks are the problem.
- Use slower attack when the sound loses punch or clarity.
- Use slower release when the gain reduction curve chatters or pumps.
- Use faster release when compression stays active too long after loud phrases.
Makeup Gain Explained
Compression usually reduces peaks and can make the processed sound seem quieter. Makeup gain adds level after compression so you can compare the processed and original signal more fairly. It is not a file-size setting and it does not undo gain reduction; it raises the compressed result.
Too much makeup gain can push the compressed waveform into clipping. In a real mix, makeup gain should be set while watching output meters and comparing at similar loudness, not just by making the compressed version louder.
Dynamic Compression vs File Size Compression
Dynamic range compression and file size compression are different processes. This page teaches the first one. The main tool on this site handles the second one by changing export-style settings such as bitrate, format, sample rate, channels, and target size.
| Topic | Dynamic range compression | File size compression |
|---|
| Goal | Control loud and quiet parts inside the sound | Reduce MB size |
| Common settings | Threshold, ratio, attack, release, makeup gain | Bitrate, format, sample rate, channels, target size |
| Used in | Mixing, recording, voice filters, streaming audio chains | File sharing, uploads, email, storage, website assets |
| Output | Sound dynamics change | File size changes |
| Main tool on this site | This visualizer explains it for learning | The Audio Compressor tool reduces file size |
Practical Settings Examples
Use these as starting points for learning the visualizer. Real audio still needs listening, because input level, microphone distance, room noise, and performance style change how much compression is triggered.
| Use case | Starting point |
|---|
| Gentle voice control | Threshold -18 dB, Ratio 2:1, Attack 10 ms, Release 120 ms, Makeup 0-3 dB |
| Podcast voice | Threshold -20 dB, Ratio 3:1, Attack 5 ms, Release 100 ms, light makeup gain |
| Strong peak control | Threshold -24 dB, Ratio 6:1, Attack 2 ms, Release 150 ms |
| Limiter-like behavior | Threshold -10 dB, Ratio 10:1 or higher, fast attack, conservative makeup gain |